dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

Btrfs: Add balance ioctl to restripe the chunks 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-04-28 15:29:52 -04:00
parent 788f20eb5a
commit ec44a35cbe
5 changed files with 208 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/btrfs/ctree.h
View File

@ -1364,7 +1364,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset,
u64 empty_size, u64 hint_byte,
u64 search_end, struct btrfs_key *ins, int data);
u64 search_end, struct btrfs_key *ins, u64 data);
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct extent_buffer *buf);
int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root

106
fs/btrfs/extent-tree.c
View File

@ -17,6 +17,7 @@
*/
#include <linux/sched.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include "hash.h"
#include "crc32c.h"
#include "ctree.h"
@ -1058,6 +1059,26 @@ static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
}
}
static u64 reduce_alloc_profile(u64 flags)
{
if ((flags & BTRFS_BLOCK_GROUP_DUP) &&
(flags & (BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID10)))
flags &= ~BTRFS_BLOCK_GROUP_DUP;
if ((flags & BTRFS_BLOCK_GROUP_RAID1) &&
(flags & BTRFS_BLOCK_GROUP_RAID10))
flags &= ~BTRFS_BLOCK_GROUP_RAID1;
if ((flags & BTRFS_BLOCK_GROUP_RAID0) &&
((flags & BTRFS_BLOCK_GROUP_RAID1) |
(flags & BTRFS_BLOCK_GROUP_RAID10) |
(flags & BTRFS_BLOCK_GROUP_DUP)))
flags &= ~BTRFS_BLOCK_GROUP_RAID0;
return flags;
}
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 alloc_bytes,
u64 flags)
@ -1068,6 +1089,8 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
u64 num_bytes;
int ret;
flags = reduce_alloc_profile(flags);
space_info = __find_space_info(extent_root->fs_info, flags);
if (!space_info) {
ret = update_space_info(extent_root->fs_info, flags,
@ -1684,6 +1707,7 @@ enospc:
error:
return ret;
}
/*
* finds a free extent and does all the dirty work required for allocation
* returns the key for the extent through ins, and a tree buffer for
@ -1697,7 +1721,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset,
u64 empty_size, u64 hint_byte,
u64 search_end, struct btrfs_key *ins, int data)
u64 search_end, struct btrfs_key *ins, u64 data)
{
int ret;
int pending_ret;
@ -1727,6 +1751,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
}
again:
data = reduce_alloc_profile(data);
if (root->ref_cows) {
if (!(data & BTRFS_BLOCK_GROUP_METADATA)) {
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
@ -1752,6 +1777,9 @@ again:
num_bytes = max(num_bytes, min_alloc_size);
goto again;
}
if (ret) {
printk("allocation failed flags %Lu\n", data);
}
BUG_ON(ret);
if (ret)
return ret;
@ -2274,8 +2302,6 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start,
{
u64 page_start;
u64 page_end;
u64 delalloc_start;
u64 existing_delalloc;
unsigned long last_index;
unsigned long i;
struct page *page;
@ -2293,7 +2319,6 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start,
ra_pages = BTRFS_I(inode)->root->fs_info->bdi.ra_pages;
file_ra_state_init(ra, inode->i_mapping);
kfree(ra);
for (; i <= last_index; i++) {
if (total_read % ra_pages == 0) {
@ -2313,26 +2338,30 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start,
goto out_unlock;
}
}
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
ClearPageDirty(page);
#else
cancel_dirty_page(page, PAGE_CACHE_SIZE);
#endif
wait_on_page_writeback(page);
set_page_extent_mapped(page);
page_start = (u64)page->index << PAGE_CACHE_SHIFT;
page_end = page_start + PAGE_CACHE_SIZE - 1;
lock_extent(io_tree, page_start, page_end, GFP_NOFS);
delalloc_start = page_start;
existing_delalloc = count_range_bits(io_tree,
&delalloc_start, page_end,
PAGE_CACHE_SIZE, EXTENT_DELALLOC);
set_page_dirty(page);
set_extent_delalloc(io_tree, page_start,
page_end, GFP_NOFS);
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
set_page_dirty(page);
unlock_page(page);
page_cache_release(page);
balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
}
out_unlock:
kfree(ra);
mutex_unlock(&inode->i_mutex);
return 0;
}
@ -2397,8 +2426,6 @@ static int noinline relocate_one_reference(struct btrfs_root *extent_root,
goto out;
}
relocate_inode_pages(inode, ref_offset, extent_key->offset);
/* FIXME, data=ordered will help get rid of this */
filemap_fdatawrite(inode->i_mapping);
iput(inode);
mutex_lock(&extent_root->fs_info->fs_mutex);
} else {
@ -2486,6 +2513,47 @@ out:
return ret;
}
static u64 update_block_group_flags(struct btrfs_root *root, u64 flags)
{
u64 num_devices;
u64 stripped = BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10;
num_devices = btrfs_super_num_devices(&root->fs_info->super_copy);
if (num_devices == 1) {
stripped |= BTRFS_BLOCK_GROUP_DUP;
stripped = flags & ~stripped;
/* turn raid0 into single device chunks */
if (flags & BTRFS_BLOCK_GROUP_RAID0)
return stripped;
/* turn mirroring into duplication */
if (flags & (BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID10))
return stripped | BTRFS_BLOCK_GROUP_DUP;
return flags;
} else {
/* they already had raid on here, just return */
if ((flags & BTRFS_BLOCK_GROUP_DUP) &&
(flags & BTRFS_BLOCK_GROUP_RAID1)) {
}
if (flags & stripped)
return flags;
stripped |= BTRFS_BLOCK_GROUP_DUP;
stripped = flags & ~stripped;
/* switch duplicated blocks with raid1 */
if (flags & BTRFS_BLOCK_GROUP_DUP)
return stripped | BTRFS_BLOCK_GROUP_RAID1;
/* turn single device chunks into raid0 */
return stripped | BTRFS_BLOCK_GROUP_RAID0;
}
return flags;
}
int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 shrink_start)
{
struct btrfs_trans_handle *trans;
@ -2494,6 +2562,7 @@ int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 shrink_start)
u64 cur_byte;
u64 total_found;
u64 shrink_last_byte;
u64 new_alloc_flags;
struct btrfs_block_group_cache *shrink_block_group;
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_key key;
@ -2511,17 +2580,20 @@ int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 shrink_start)
shrink_block_group->space_info->total_bytes -=
shrink_block_group->key.offset;
printk("shrink_extent_tree %Lu -> %Lu type %Lu\n", shrink_start, shrink_last_byte, shrink_block_group->flags);
path = btrfs_alloc_path();
root = root->fs_info->extent_root;
path->reada = 2;
again:
trans = btrfs_start_transaction(root, 1);
do_chunk_alloc(trans, root->fs_info->extent_root,
if (btrfs_block_group_used(&shrink_block_group->item) > 0) {
trans = btrfs_start_transaction(root, 1);
new_alloc_flags = update_block_group_flags(root,
shrink_block_group->flags);
do_chunk_alloc(trans, root->fs_info->extent_root,
btrfs_block_group_used(&shrink_block_group->item) +
2 * 1024 * 1024, shrink_block_group->flags);
btrfs_end_transaction(trans, root);
2 * 1024 * 1024, new_alloc_flags);
btrfs_end_transaction(trans, root);
}
shrink_block_group->ro = 1;
total_found = 0;

11
fs/btrfs/inode.c
View File

@ -2864,6 +2864,15 @@ int btrfs_defrag_file(struct file *file) {
goto out_unlock;
}
}
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
ClearPageDirty(page);
#else
cancel_dirty_page(page, PAGE_CACHE_SIZE);
#endif
wait_on_page_writeback(page);
set_page_extent_mapped(page);
page_start = (u64)page->index << PAGE_CACHE_SHIFT;
page_end = page_start + PAGE_CACHE_SIZE - 1;
@ -3105,6 +3114,8 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_resize(root, (void __user *)arg);
case BTRFS_IOC_ADD_DEV:
return btrfs_ioctl_add_dev(root, (void __user *)arg);
case BTRFS_IOC_BALANCE:
return btrfs_balance(root->fs_info->dev_root);
}
return -ENOTTY;

115
fs/btrfs/volumes.c
View File

@ -869,6 +869,107 @@ out:
return 0;
}
static u64 div_factor(u64 num, int factor)
{
if (factor == 10)
return num;
num *= factor;
do_div(num, 10);
return num;
}
int btrfs_balance(struct btrfs_root *dev_root)
{
int ret;
struct list_head *cur;
struct list_head *devices = &dev_root->fs_info->fs_devices->devices;
struct btrfs_device *device;
u64 old_size;
u64 size_to_free;
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_chunk *chunk;
struct btrfs_root *chunk_root = dev_root->fs_info->chunk_root;
struct btrfs_trans_handle *trans;
struct btrfs_key found_key;
dev_root = dev_root->fs_info->dev_root;
mutex_lock(&dev_root->fs_info->fs_mutex);
/* step one make some room on all the devices */
list_for_each(cur, devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
old_size = device->total_bytes;
size_to_free = div_factor(old_size, 1);
size_to_free = min(size_to_free, (u64)1 * 1024 * 1024);
if (device->total_bytes - device->bytes_used > size_to_free)
continue;
ret = btrfs_shrink_device(device, old_size - size_to_free);
BUG_ON(ret);
trans = btrfs_start_transaction(dev_root, 1);
BUG_ON(!trans);
ret = btrfs_grow_device(trans, device, old_size);
BUG_ON(ret);
btrfs_end_transaction(trans, dev_root);
}
/* step two, relocate all the chunks */
path = btrfs_alloc_path();
BUG_ON(!path);
key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
key.offset = (u64)-1;
key.type = BTRFS_CHUNK_ITEM_KEY;
while(1) {
ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0);
if (ret < 0)
goto error;
/*
* this shouldn't happen, it means the last relocate
* failed
*/
if (ret == 0)
break;
ret = btrfs_previous_item(chunk_root, path, 0,
BTRFS_CHUNK_ITEM_KEY);
if (ret) {
break;
}
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
path->slots[0]);
if (found_key.objectid != key.objectid)
break;
chunk = btrfs_item_ptr(path->nodes[0],
path->slots[0],
struct btrfs_chunk);
key.offset = found_key.offset;
/* chunk zero is special */
if (key.offset == 0)
break;
ret = btrfs_relocate_chunk(chunk_root,
chunk_root->root_key.objectid,
found_key.objectid,
found_key.offset);
BUG_ON(ret);
btrfs_release_path(chunk_root, path);
}
ret = 0;
error:
btrfs_free_path(path);
mutex_unlock(&dev_root->fs_info->fs_mutex);
return ret;
}
/*
* shrinking a device means finding all of the device extents past
* the new size, and then following the back refs to the chunks.
@ -985,15 +1086,6 @@ int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
return 0;
}
static u64 div_factor(u64 num, int factor)
{
if (factor == 10)
return num;
num *= factor;
do_div(num, 10);
return num;
}
static u64 chunk_bytes_by_type(u64 type, u64 calc_size, int num_stripes,
int sub_stripes)
{
@ -1040,6 +1132,11 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
int stripe_len = 64 * 1024;
struct btrfs_key key;
if ((type & BTRFS_BLOCK_GROUP_RAID1) &&
(type & BTRFS_BLOCK_GROUP_DUP)) {
WARN_ON(1);
type &= ~BTRFS_BLOCK_GROUP_DUP;
}
dev_list = &extent_root->fs_info->fs_devices->alloc_list;
if (list_empty(dev_list))
return -ENOSPC;

1
fs/btrfs/volumes.h
View File

@ -134,4 +134,5 @@ struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
u8 *uuid);
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
int btrfs_init_new_device(struct btrfs_root *root, char *path);
int btrfs_balance(struct btrfs_root *dev_root);
#endif